CVE-2026-23326 (GCVE-0-2026-23326)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-03-25 10:27
VLAI?
Title
xsk: Fix fragment node deletion to prevent buffer leak
Summary
In the Linux kernel, the following vulnerability has been resolved: xsk: Fix fragment node deletion to prevent buffer leak After commit b692bf9a7543 ("xsk: Get rid of xdp_buff_xsk::xskb_list_node"), the list_node field is reused for both the xskb pool list and the buffer free list, this causes a buffer leak as described below. xp_free() checks if a buffer is already on the free list using list_empty(&xskb->list_node). When list_del() is used to remove a node from the xskb pool list, it doesn't reinitialize the node pointers. This means list_empty() will return false even after the node has been removed, causing xp_free() to incorrectly skip adding the buffer to the free list. Fix this by using list_del_init() instead of list_del() in all fragment handling paths, this ensures the list node is reinitialized after removal, allowing the list_empty() to work correctly.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 560c974b7ccd95bb9ff20df77f6654283e45c9c6 , < 5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d (git)
Affected: fd5614763805d6f386bd07cc53558f88b1b1eb62 , < 2a9ea988465ece5b6896b1bdc144170a64e84c35 (git)
Affected: b692bf9a7543af7ad11a59d182a3757578f0ba53 , < 645c6d8376ad4913cbffe0e0c2cca0c4febbe596 (git)
Affected: b692bf9a7543af7ad11a59d182a3757578f0ba53 , < b38cbd4af5034635cff109e08788c63f956f3a69 (git)
Affected: b692bf9a7543af7ad11a59d182a3757578f0ba53 , < 60abb0ac11dccd6b98fd9182bc5f85b621688861 (git)
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    Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc3 , ≤ * (original_commit_for_fix)
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          "programFiles": [
            "include/net/xdp_sock_drv.h",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: Fix fragment node deletion to prevent buffer leak\n\nAfter commit b692bf9a7543 (\"xsk: Get rid of xdp_buff_xsk::xskb_list_node\"),\nthe list_node field is reused for both the xskb pool list and the buffer\nfree list, this causes a buffer leak as described below.\n\nxp_free() checks if a buffer is already on the free list using\nlist_empty(\u0026xskb-\u003elist_node). When list_del() is used to remove a node\nfrom the xskb pool list, it doesn\u0027t reinitialize the node pointers.\nThis means list_empty() will return false even after the node has been\nremoved, causing xp_free() to incorrectly skip adding the buffer to the\nfree list.\n\nFix this by using list_del_init() instead of list_del() in all fragment\nhandling paths, this ensures the list node is reinitialized after removal,\nallowing the list_empty() to work correctly."
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        "dateUpdated": "2026-03-25T10:27:19.021Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/60abb0ac11dccd6b98fd9182bc5f85b621688861"
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      "title": "xsk: Fix fragment node deletion to prevent buffer leak",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23326",
    "datePublished": "2026-03-25T10:27:19.021Z",
    "dateReserved": "2026-01-13T15:37:45.996Z",
    "dateUpdated": "2026-03-25T10:27:19.021Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23326\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:29.687\",\"lastModified\":\"2026-03-25T15:41:33.977\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxsk: Fix fragment node deletion to prevent buffer leak\\n\\nAfter commit b692bf9a7543 (\\\"xsk: Get rid of xdp_buff_xsk::xskb_list_node\\\"),\\nthe list_node field is reused for both the xskb pool list and the buffer\\nfree list, this causes a buffer leak as described below.\\n\\nxp_free() checks if a buffer is already on the free list using\\nlist_empty(\u0026xskb-\u003elist_node). When list_del() is used to remove a node\\nfrom the xskb pool list, it doesn\u0027t reinitialize the node pointers.\\nThis means list_empty() will return false even after the node has been\\nremoved, causing xp_free() to incorrectly skip adding the buffer to the\\nfree list.\\n\\nFix this by using list_del_init() instead of list_del() in all fragment\\nhandling paths, this ensures the list node is reinitialized after removal,\\nallowing the list_empty() to work correctly.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2a9ea988465ece5b6896b1bdc144170a64e84c35\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60abb0ac11dccd6b98fd9182bc5f85b621688861\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/645c6d8376ad4913cbffe0e0c2cca0c4febbe596\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b38cbd4af5034635cff109e08788c63f956f3a69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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